Question

How to use strftime() to format time like a Unix timestamp in C

Answer 1

#include <time.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
    struct timeval tv;
    
    gettimeofday(&tv, NULL);
    
    struct tm *tm;
    char strf[64], snpr[64];

    if ((tm = localtime(&tv.tv_sec)) != NULL) {
        strftime(strf, sizeof strf, "%Y-%m-%d %H:%M:%S.%%06u %z", tm);
        snprintf(snpr, sizeof snpr, strf, tv.tv_usec);
        printf("%s", snpr); 
    }

    return 0;
}



/*
run:

2023-11-22 19:48:33.877383 +0000

*/

 

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